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DEVICE FOR CLEANING STREET SEWER PIPES. No. 309,696. Patented Dec. 23, 1884.

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DEVICE FOR CLEANING STREET SEWER PIPES.

No. 809,696. Patented Dec. 23, 1884.

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THOMAS DARK, F KUFFALO, NEW YORK.

DEVICE FOR CLEANING STREET SEWER PBPES.

SPECIFICATION forming part of Letters Patent No. 309,696, dated December 23, 1884.

Application filed July '7, 1884. (X0 model.)

To all whom, it may concern.-

Be it known that I, THOMAS Dame. a citizen of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented certain new and useful Improvements in Devices for Cleaning Street Sewer-Pipes and Sewers, of which the following is a specification, reference being had therein to the accompanying drawings.

This application relates to improvements on my patent of August 10, 1880, No. 231,015, for devices for cleaning out street sewerpipes and sewers and the present imp rovements relate more particularly to the manholes in the streets and their covers, all as fully hereinafter explained.

In the drawings, Figure 1 is a longitudinal section divided in the middle, showing the sewer, the street-openings thereinto, the devices for cleaning, &c.; Fig. 2, a top plan showing the oval manhole opening into sewer; Fig. 3, a top plan of oval metal rim to man hole; Fig. 4, a top plan of cover for same; and Figs. 5 and 6, crosssections of cover, showing the under braces.

A A represent the vertical. openings into the sewer S, with its catch-basins l; beneath. The mouth or man-hole A to these openings is on a level with the street, and has a castiron frame of oval form set therein corresponding to the form of the opening A. It is made oval for the reason that the ordinary round man-hole would be too small to set the leg 0 of my cleaning device in and allow a man therein to work at the same time, and if made larger and round it would. take too much room in the street. By making it oblong or oval plcnty of" room for the working of the device is got and the manhole onlya little enlarged one way-viz., in length. This oval opening is surrounded by a metal rim, I, and which projects into thegronnd a short distance, ending in a ilangc, Irt, which rests on the brick walls of the man-hole, on which sets the pavement, which will come flush with the top of the rim. Inside, and a little below the outer rim, is another rim. 1', forming a seat for the cover T to set on, the seat having inside projecting lugs, s 5, (see Fig. 3,) to give additional surface for the cover to rest on and insure stability. The cover is of iron, and is strengthened by cross-braces, it, cast on the under side, as in Figs. 5 and 6, and in dotted lines, Fig. 4.. These are mainly to prevent the cover springing out when an evenly stepped on by a horse, the ends of the braces projecting down below the seat 4? and setting close to the wall of the rim, in Figs. 5 and 6. In addition, headed pins or lug projections n a on the sides or edge of the cover are made, which set into corresponding slots or depressions, w 10, in the upper rim, R. cept by a straight upward pull, and will prevent rattling and danger of coming off to the injury of horses legs, &c. The oblong shape of the cover is important, as it cannot be j nmped out by any peculiar pressure 011 its edges, as round ones are liable to be. These oval openings will usually be about two feet wide by three feet long; and in cleaning sewers and sewer-pipe by my devices previously patented the winch or windlass will set over it, yet giving plenty of room for working the chain E from the windlass over the sheave 7.: and through the sewer, making a connection from one windlass to the other, as explained in my patent previously mentioned.

Attached to the chain E are the cup-plow 1 then a comiecti'ngrod, c,(instead ofa chain, as in the previous patent,) fastened to the back of the plow by a rule-joint, and at its other end by a similar joint to an open mouthed scraper, f. The stiitrod c and joints are important to keep the scrapers in proper position and guide them, and also prevent their turning or twisting, and to especially prevent their catching on the curved edges of sewers and getting last.

I claim-- 1. In combination with the vertical openings A A in streets, and which lead. to the sewer or sewer-pipe, the oval-shaped manholes A, having the metal rim B and flange R, seat '2', lugs s s, and cover T, all arranged substantially as and for the purpose specified.

2. The combination of the street-openings A A, oval man-hole A, metal flanged rim R t r, the rim 1% having slots in 10 therein, and the cover T, provided with projecting headed These all make the cover immovable 6X- Y -5 vided with the under cross-braces, t t, the

lugs to u to set therein, all substantially as and In testimony whereof I affix my signature for the purpose specified. in presence of two witnesses.

3. In combination with the oval man-hole s A and metal rim R R a", the cover T, pro- I THOMAS DARK.

ends projecting downward and. coming close WVitnesses: to the inside wall of rim R, as and for the pur- J. R. DRAKE, v pose specified. T. H. PARSONS. 

